Fluid dispensing apparatus



June 13, 1939. v, D, BARKER 2,162,474

FLUID DISPENSING APPARATUS Filed May 25, 1958 4 Sheets-Sheet 1 June 13, 1939. v. D. BARKER FLUID DISPENSING APPARATUS Filed May 23, 1938 4 Sheets-Sheet 2 f drusy,(

June 13, 1939. v. BARKER 2,162,474

FLUID DISPENSING APPARATUS IN VE N 70? Mae/4 0 800x512,

June l3, 1939. v. D. BARKER I FLUID DISPENSING APPARATUS Filed May 25, 1938 4 Sheets-Sheet 4 0 f M z y w 5 n A Patented June 13, 1939 V UNITED STATES PATENT OFFICE 13Claim8.

Although not limited to any particular embodiment, my invention may be advantageously embodied in apparatus for dispensing air at an automobile service station. At such a station, compressed air is principally used for operation of elevators to lift vehicles to permit them to be greased with facility; to dispense grease under pressure to the bearings of such vehicles, and to inflate the vehicle tires. It is ordinary practice to highly compress air, say to 150 pounds per square inch, by a pump operated by an electric motor, and to store it in a supply tank from which it may be released through dispensing apparatus which is adjustable to. predetermine the U pressure to which any air receiver may be charged.

Letters Patent of the United States No. 1,655,003 was granted January 3, 1928, to J. C.- Woodford and this applicant for Apparatus for supplying air under pressure, of the class above contemplated and operative to dispense compressed air by a succession, of pulsations until the back pressure through the dispensing conduit .reaches that to which the device is adjusted. That Letters Patent was reissued April 24,'1934, to Service Station Equipment Company, a corporation of the State of Delaware, which has extensively sold apparatus within the description of the claims of said original patent and reissue thereof. The apparatus shown in said patent included an electrically energized audible signal, sounded at each pulsation, and the dispensation of compressed air was controlled by electrical power means and controlling circuits, associated with a single diaphragm chamber containing a flexible diaphragm subjected to air pressure from. the dispensing conduit; such air pressure on said diaphragm being opposed by a compressed spring bearing directly on said diaphragm; the pressure of that spring being manually variable and indicated by an index pointer carried by a screw,

the rotation of which compressed said spring, which pointer cooperated with a stationary dial marked to indicate pounds pressure of the air.

- dispensed.

The apparatus shown insaid patent is. so constructed that it, and its associated audible signal, do not always operate in uniformly intermittent cycles when said apparatusjs used to inflate a tire to a high pressure approaching that of the pressure of the source of supply of air; particularly during the initial stage of inflation under such conditions. 'My present invention avoids the necessity of employing electrical power in addition to the power available in the customary compressed air supply, and the cycles are uniform under all conditions, with consequently quicker inflation.

Therefore, the principal object and eflect of my present invention is to provide a fluid dis- 5 pensing apparatus of simple, solely mechanical, design which operates in a uniformly intermittent manner, with a uniform audible signal, over a wide range of combinations of pressure adjustment and initial receiver pressure, without 10 employing any electrical power means or controlling circuit. My invention operates in positively controlled cycles of pulsating charges of fluid to a receiver; each charge of fluid being terminated at a regularly uniform interval after its initiation, independently of either the back pressure in the receiver or the fluid resistance in the service conduit. In addition, my device does not require any appreciable energy drain from, or reduction in, available pressure of a 20.

fluid to be delivered to the receiver. This is accomplished by utilizing the energy of the fluid directly from the source to furnish power for operating the apparatus, which fluid is subsequently exhausted to atmosphere.

As hereinafter described, an essential feature of the present invention is the provision of two separate and distinct diaphragm chambers each containing a flexible diaphragm, the fluid pressure upon-which is opposed by separate and dis- 3o tinct springs; one of said diaphragms being subjected to fluid pressure from the air dispensing conduit and the other of said diaphragms being subjected to the pressure directly from the supply reservoir. Moreover, the present inven- 35 tion provides an'improved construction and arrangement of controlling valves and cam and cam roller levers operatively connected with said two diaphragms and their springs for adjustably controlling the dispensation of the fluid. 40

My invention comprises the various novel features of construction and arrangement hereinafter more definitely specified and including a bell signaling device for manifesting each pula sation of the apparatus during a dispensing operation.

In said drawings, Fig. l. is a front elevation of a casing, connected with arconduit leading from the fluid supply reservoir and a fluid disw pensing conduit, and inclosing the two diaphragms and having indicating mechanism including a plurality of adjustable numbered wheels; said casing supporting the signal bell and means for operating it.

Fig. II is a planvlew of the structure shown in Fig. I.

Fig. III is a rear elevation of the structure shown in Fig. I, omitting the rear cover plate for said casing.

Fig. IV is an elevation of the'right hand side of the structure shown in Figs. I and II.

Fig. V is a vertical sectional view of said structure taken on the line V, V in Figs. I, II, and III.

Fig. V1 is a sectional view of the valve casing shown in Fig. III, taken on the line VI, VI in Fig. V.

In said drawings, the main casing I incloses two diaphragm chambers 2 and I. each containing a reciprocatory diaphragm, respectively 4 and 5. The fluid pressure supply conduit 6 from any suitable source of highly compressed air, supplies such air to said diaphragm chambers under automatic valve control, as hereinafter described. The fluid pressure service conduit 8 leads fromsaid chamber 3 and the compressed air is dispensed through it. For the purpose of servicing and inflating automobile tires, said service conduit 8 may have a dispensing hose connected therewith having at the end thereof a suitable connector or chuck for convenient attachment to a tire valve stem; such chuck embodies a spring pressed valve which closes to prevent air from escaping from the hose when not attached to a tire stem, but is automatically opened and automatically unseats the tire valve when the chuck is properly applied to the tire valve stem.

Said diaphragm 5, which is subjected to the 'fluid pressure in said service conduit 6 has operatively connected therewith the reciprocatory plunger III. The bell crank lever II, which is fulcrumed on the shaft I2 in bearings I3. I3

in said casing I, has its short arm II in co-- operative relation with said plunger III and has its long arm II" connected with the right hand end of the spring I6. The left hand end of said spring I5 carries the nut I6 which is in threaded engagement with the adjusting screw I! cut on the shaft I8 extending exterior to said casing I and provided with the crank handle II by which it may be adjusted. That is to say, the stress of said spring I5 may be increased by turning said crank I9 clockwise or decreased by turning it counterclockwise.

I find it convenient to connect with said shaft I8 indicating means for manifesting in pounds the pressure of fluid to be dispensed for which said spring I 5 is manually adjusted. Such means includes the gear pinion 2I on said shaft I6, the intermediate gear 22 which is journaled on' the stud 23 mounted in the bracket 24 which is rigidly oonnectedwith said casing I. Said intermediate gear 22 meshes with the indicator gear 26 on the shaft 21 which is journaled in said bracket 24 and the bracket 28 which is also rigidly connected with said casing I. Said shaft 2'I has rigidly connected therewith the wheel 26 having on its circumference a series of numbers from 1 to 9 inclusive and 0. Said wheel 29, which indicates individual pounds, is connected by tens transfer gearing with the similarly .numbered wheel 30. each of the numbers on which represents ten pounds, and said wheel 30 is operatively connected with the similarly numbered wheel 8| which represents hundreds of pounds. Such connection is conveniently effected by respective transfer pinions 22 and 33 which are loosely journaled on the shaft 34 carried in said brackets 24 and 26. Said pinions are intermittently .order, the wheel of the next higher order is turned one-tenth of a revolution. As manifested by said indicating mechanism in Fig. I, the screw II has been manually adjusted to insure dispensation of compressed air through the service conduit 8, to charge an automobile tire or other receptacle with a pressure of thirty-five pounds per square inch.

Referring to Figs. III and VI, said supply conduit 6 is connected with the valve casing 40 in communication with the fluid passage 4| therein which connects with the parallel fluid passageways 42 and 43 in said casing 40. The air conduit 45 extends from said passageway 42 to the T-fitting 45 which opens into the diaphragm chamber 2, beneath said diaphragm 4. Said fitting 45 has the vent nozzle 45" leading therefrom to the atmosphere and the vent 45"- therethrough is very much smaller than the cross sectional area of the conduit 45 and passageway 42; the purpose of said vent being to slowly bleed the fluid pressure from beneath said diaphragm 4 when the latter is not held up by fluid pressure through said conduit 45. Passage of the high pressure air from said supply conduit 6 to said diaphragm chamber 2 is controlled by the reciprocatory valve 46 which may be opened by the slidably fitted push rod 46 extending through the bearing 40' on said valve casing 46. Push rod 46' is pivotally connected by the link 41 with the push link 46 which has the slot 46' extending parallel with said push rod 46' and engaging the stud II on said bell crank lever long arm II"; whereby opening movement of said valve 46 is initiated as hereinafter described.

Said diaphragm 4, which is subjected to the high pressure in said supply conduit 6, when said valve 46 is open, has operatively connected therewith the reciprocatory plunger 49. The bell crank lever 50, which is fulcrumed on the shaft 5| mounted in bearings 52, 52' in said casing I, has its short arm 50' in cooperative relation with said plunger 49 and has its long arm 50" connected with the left hand end of the spring 54. The right hand end of said spring 54 is connected with the stationary anchor stud 55 in said casing I. The effect of that arrangement is that the long arm 50" of said bell crank lever 50 is moved to the left in Fig. III when said valve 46 is open and the fluid pressure in the diaphragm chamber 2 beneath the diaphragm 4 overcomes the stress of said spring 54, but, when said valve 46 is closed, that pressure is exhausted through said vent 45 and the stress of said spring 64 moves said lever 50 clockwise to the position shown in Fig. III, where it is stopped by the stop stud 50 fixed in said casing I.

The right hand end of said link 41 is pivotally connected with the rocker cam lever 56 which is mounted to oscillate on the stationary fulcrum stud 51 which is fixed in said casing I. Said cam lever 66 has at its upper end the pointed cam 56' adapted to rock back and forth in cooperative relation with the cam roller 56 carried by the cam roller lever 56. Said lever 58 is fulcrumed on the stud 66' fixed in the long arm 50" of the lever 66, and the opposite end of said lever II is connected by the spring I! with the stationary anchor st'ud 60 which is flxed in said casin I. The effect of that arrangement is to continually stress said roller 55',into cooperative relation with said pointed cam 58' and to 'snap said rocker cam lever counterclockwise and fully open valve 46, by the roller 56, when the crest of cam 56' is pushed, by said link 48, to the left of a line taken through the centers of said roller 58 and said fulcrum stud 51; which roller is alternately moved back and forth in a substantially horizontal plane by said bell c'r'ank lever 58 and cam roller lever 58.

Referring to Figs. III and VI; high pressure air is supplied from said conduit 6 to the diaphragm chamber 3 and service conduit 8 through the supply conduit 5' which has its upper end connected with said valve casing 48 in communication with the air passage 43, and has its lower end connected with the T-fitting 8' which is con- 0 nected with said diaphragm chamber 3 and with said service conduit 8. The passage of high pressure air from said supplyconduit 6 through said passageway 43 to said diaphragm chamber 3 and service conduit 8, is controlled by the valve BI which has the push rod 8I extending through the stuffing box 40" on said valve casing 48 to open it and the spring 6| to shut it. Said push rod 8| is pivotally connected, by the link 62, with the rocker cam lever 63 which is mounted to oscillate on said stationary fulcrum stud 5I fixed in said casing I.. Said cam lever 63 has atits upper end the pointed cam 83' and is adaptedto be snapped clockwise to open said valve 6 I, and to be snapped counterclockwise, to permit said valve to close.

Such snap action is. effected by the cam roller 63' which is carried by the cam roller lever 55. Said lever 85 is fulcrumed on said stud .58 flxedin the long arm 50" of the lever 50, but on the side of said arm opposite to said lever 58. The opposite end of said lever 55 is connected by the spring 55.

with said anchor stud fixed in-said casing I,

to continually stress said cam roller 53 into cooperative relation with the face of saidpointed cam 88'. Y

The combined effect of the two bell crank levers II and 58, their springs I5 and 54, and the lever linkage connecting them in the cooperative relation above described, is to dispense the highly compressed air, in pulsations, through the service conduit 8, until the selected pressure, variably predetermined by the adjustment of said screw II, is attained in the tire. or other air receiver, a d, with the adjustment indicated, that pressure would be thirty-five'pounds per square inch: whereupon, the instant dispens ng operation is automatically terminated. r

In order to manifest to the operator the fact when any dispensing operation is continuing; I find-it convenient to providean audible signaling device which is sounded at eachpulsation when said cam 56 snaps counterclockwise. Such a device is shown in Fig. I including the bell 68 (which is supported on the standard 85 fixed on the front of easing I), and the clapper comprising the striker I0 and clapper lever II, which latter is fulcrumed on the stud 'II, which is stationary on the front of casing I, as indicated in Figs. I and IV.

Said clapper lever I0 normally hangs, with its striker III in spaced relationwith said bell 68, as indicated in Fig. I, which corresponds with the position of the partsshown in Fig. III. In that position it hangs againstthe signal crank stud I2 15 which is fixed in said rocker cam lever 55 and valve casing 40 in casing I projects through the slot I8 in the front wall of said main casing I. However, as said cam lever- 55 is pushed counterclockwise in Fig. 111 by the pull of spring I5, when the diaphragm 5 is allowed to fall by the escape of fluid pressure from beneath 5 it into said service conduit 8, when the valve 46 is opened, as above described; said signal crank stud I2 is carried by the cam lever 56 to the left in Fig. I and, as the fluid pressure admitted to the diaphragm chamber 2 turns the bell crank lever 10 50 counterclockwise, and effects the return of said cam lever 56 toward the position shown in Fig. 111, the consequent movement of the signal crank stud I2 to the right in Fig. I swings said clapper lever III and thus strikes the signal bell 15 Q r 58 with the striker I0, at the termination of each pulsation of air dispensed. Therefore, when said audible signal ceases to sound, the operator is apprised that the instant dispensing operation is completed by the increment of pressure in the so tire or other air receiver to the pressure for which the apparatus has been set by adjustment of said screw II.

Referring to Fig. III, said stud 55, fixed in casing I, limits the movement of bell crank lever II 95 Q by. spring I5, when the set screw II encounters it. 'Counterclockwise movement of rocker cam lever 58 in opening valve 45, is stopped by the stop stud I5 fixed in casing I. The stop stud I6, in casing I, limits the movement of rocker cam lever 68, in open ng valve 6|.

To facilitate the assembling of valve casing 40 in the casing I, I provide the slot 11, extending through valve casing 48 to receive bolt 18 fixed in casing I. Said bolt is engaged by nut I8"to hold As shown in Fig. VI, the left hand ends of the air passages 42 and 43 are respectively closed by thescrews and 8I and the latter has the cylindrical extension 8| 'which, as shown ill-Fig. III,-fits in ahole l' in said casing I to insure that said valve casing 40 shall bein proper vertical position. Said screws 80 and 8I 'are recessed to receive the outer ends of said valve springs 45 and ii, the inner ends of which are respectively seated in recesses in a said valves 45 and BI. Said springs continually tend to close said valves upon their seats in the casing 48. I prefer to provide a back cover plate I forsaid casing I, having a slot I5" to guide the stud I8 on the nut I6 and prevent turning movement of the latter. Said plate is secured by the nut I 'fon the threaded end of the stop stud I8 shown in Fig. V and is prevented from turning by engagement of the anchor stud 55 in a hole in said plate.

Saidapparatus may be operated as follows:

The conduit 8 is connected, conveniently bya hose with a terminal chuck valve, to a h're or,

other air receiver containing less than the selected pressure of, say, thirty-five pounds, and air .0 thus allowed to pass from diaphragm chamber 3 to such receiver. The air pressure within chamber 3 is thus reduced, and as that pressure approaches said selected pressure, spring I5 draws the upper arm I I" of bell crank lever II to the left, in Fig. 111. when the pressure in diaphragm chamber 8 is thus lowered to thirty-five pounds, lever arm II has thus moved far enough for stud II to engage the left end of slot 48' in we push link 48 and move the latter, to the left, with consequent movement of the upper end of cam rocker lever- 56, to the left, far enough to move the crest of its cam 56' to an unstable position. Consequently, spring 59 pulls roller 58, by lever is Il, downward along the right hand incline of cam 56', turning rocker -cam lever 56 counterclockwise and thrusting link 41 and push rod 46' to the left and thereby thrusting valve 46 open, until the lower end of cam lever 58 -stops against stud 15. The highly compressed air is thus allowed to flow from the source through supply conduit 6 and passage 4|, past valve 46 and through air conduit 45 and T-fltting 45' into diaphragm chamber 2, faster than it can escape through the restricted vent 45', flexing diaphragm 4 upward and forcing plunger 49. to turn bell crank lever ll counterclockwise against the stress of spring '4. As the arm 50" of lever 50 moves to the left it carries with it the stud 50' and both roller levers 58 and 65. Consequently, both cam rollers 56' and 63- are drawn upward along the right hand inclines of respective rocker cams 56' and i3; pressing both counterclockwise. However, roller 63' passes over the crest of rocker cam 6'! before roller it reaches the crest of cam 56' and, at that instant, spring 68 snaps roller 83, by lever I, downward along the left incline of cam 08, so as to turn cam lever 63 clockwise and snap link 62 and push rod BI and valve 6| to the left, opening valve 6|, until the lower end of cam lever 63 stops against stud 16. Opening valve Cl allows the highly compressed air to flow from the supply conduit 8, through passage 43, conduit T-fltting 8', conduit 8, hose and chuck valve, to the tire or other air receiver. After cam roller 6| thus passes to the left of the crest on rocker camJi' unseating valve 6! cam roller 56* to the left of the .crest on rocker cam 5,6 and causes cam lever I! to turn clockwise to permit valve 48 to be closed by its spring 48' to thus stop the flow of compressed air to diaphragm chamber 2. Such clockwise movement of the rocker cam lever R is stopped by its lower end encountering stop stud It or push link 48, while the signal is sounded by the crank" swinging the clapper lever II and ringing the bell 68 with the striker II. The latter movement of the cam roller lever 58 stops; with the roller'li' on the left hand side of the cam II, as shown in Fig. 111.

After the valve 40 is closed, air escaping from beneath diaphragm 4 through the restricted vent 43, reduces the pressure beneaththe diaphragm 4; thus permitting bell crank lever I. to be turned clockwise by the stress of the spring '4. As the latter motion occurs, cam levers I. and I are driven to the right, so that cam rollers I. and I climb up the left hand inclines of the respective rocker cams 56' and II, pressing both cam levers It and 63 clockwise. When roller .3 passes to the right of the crest of cam I, rocker cam lever 43 is snapped counterclockwise by roller pulled down by spring 66, and valve II is closed by its spring 6!- and stops the flow of air through valve I to conduit 8'. V

During the-period when valve I is open. air flows from the supply conduit [to the conduit 6' through fitting 8' and into the service conduit I and thence into the receiver. The relation between supply pressure, back pressure in the receiver, and the fluid resistance of the entire service conduit will determine whether or not the pressure in the diaphragm chamber 8 rises above the pressure for. which the device is adjusted; If the pressure does not higher than the adjusted pressure, then the lever H will remain in its extreme counterclockwise position, limited by adjustment screw li whereupon, cam ll will be restrained by push link 4| from returning fully to theposition shown iii-Fig. m. If

the pressure rises higher than the adjusted pressure, the cam lever 56 is stopped by its lower end encountering the stop stud 16. Upon return of lever 50, to the position shown in Fig. III, cam roller 56 will pass over the crest of cam it, turning cam 56 counterclockwise to initiate another cycle of operation. If the pressure within the tire is yet less than the selected pressure, pressure within diaphragm chamber 3 will remain below or be reduced. to the selected pressure, by escape into the tire, and the cycle above described will be repeated until the pressure in diaphragm chamber 3 and in the tire and connecting conduits is equalized, and then bell crank lever arm II" is held as in Fig. III; preventing another opening of said valve 45, and bell 68 is silent, indicating completion of dispensation. Thereupon, conduit 4 maybe disconnected from the tire, or other receiver, leaving the latter charged to very slightly above the selected pressure. Therefore, in such idle position of the apparatus, both of the valves 46 and 8! are closed and air of not less than the selected pressure is trapped in the diaphragm chamber 3; so that, when the pressure in chamber 3 is permitted to escape, as above described, or otherwise, a dispensing operation is initiated, by operation of mechanism inciuding bell crank lever II, and such mechanism exemplifies the means for initiating" contemplated in certain of the claims. The mechanism including bell crank lever 50 exemplifies what is termed in certain of the claims "power mechanism, for limiting the charge of fluid dispensed without further control by said initiating means. It may be observed that in such apparatus as disclosed in Patent No. 1,655,003 aforesaid, the

means for initiating the dispensing operation also controls the means for terminating the dispensing operation, contraryto the present invention.

However, Ido not desire to limit myself to the specific details of construction, arrangement, or method of operation herein set forth, as it is obvious that various modifications may be made therein without departing from the essential features of my invention, as defined in the appended claims.

I claim:

1. In fluid dispensing apparatus, the combination of a source of fluid under pressure; a conduit adapted for connection with a receiver; a valve between said source and said conduit; means in operating relation to said valve; pressure sensitive means connected to said conduit and adapted to transfer an actuating impulse to said first means when the pressure in the conduit falls to that at which the apparatus is adjusted; said first means comprising, means, responsive to said actuating impulse, to open said valve, to maintain said valve in open position for a predetermined period, and to close said valve in a cycle; whereby said cycle is completed, each time it is initiated, without further influence from said p ure sensitive means.

In fluid dispensing apparatus, the combination of a source of fluid under pressure; a conduit adapted for connection with a ver; a valve between said source and I conduit; means in operating relation to said valve; ad- ,lustable pressure sensitive means connected to said conduit and adapted to transfer an actuating impulse to said first means when the pressure in the conduit falls to that at which the apparatm is adjusted; said first means comprising means, responsive to said actuating impulse, to open said valve, to maintain said valve in open position for a predetermined period, and to close said valve in a cycle; whereby saidcycle is completed, each time it is initiated, without further influence from said pressure sensitive means.

3. In a fluid dispensing apparatus, the combination of a source of fluid under pressure; -a conduit adapted for connection with a receiver;

' a valve between said sourceand said conduit;

power mechanism in operating relation to said valve; pressuresensitive means connected to said conduit and adapted to transfer an. actuating impulse to said power mechanism when the pressure in the conduit falls to that at which the apparatus is adjusted; said power mechanism comprising means, responsive to said actuating impulse, to open said valve, to maintain said valve in open position for a predetermined period, and to close said valve in a cycle; whereby said cycle is completed, each timeit is initiated, without further influence from said pressure sensitivemeans.

4. In a fluid dispensing apparatus-the combination of a source of fluid under pressure; a conduit adapted for connection with a receiver; a valve between said source and said conduit; power mechanism in operating relation to said valve; adjustable pressure sensitive means connected to said conduit and adapted to transfer an actuating impulse to said power mechanism when the pressure in the conduit falls to that at which the apparatus is adjusted; said power mechanism comprising means, responsive to said actuating impulse, to open said valve, to maintain said valve in open position for a predetermined period, and to close said valve in a cycle;

' adapted to receive said actuating impulse and to follow a predetermined cycle of opening said. valve,

maintaining said valve open for a predetermined period, and closing said valveindependently of further influence from said pressure sensitive means.

6. In a device for dispensing fluid, the combination of a source of supply; a conduit, adapted for connection with a receiver; adjustable pressure sensitive means adapted to transfer an actuating impulse upon reduction of the pressure in the conduit to a predetermined value; a valve between said source of supply and said conduit; valve controlling mechanism connected to the source of supply and adapted to receive said actuating impulse and to follow a predetermined cycle of opening said valve, maintaining said valve open for a predetermined period, and closing said valve independently of further influence from said pressure sensitive means.

7. In fluid dispensing apparatus, the combination of a source of fluid under pressure; a conduit adapted for connection with a receiver; a valve between said source and. said conduit; power mechanism in operating relation to said valve; a pressure sensitive diaphragm connected to said conduit and adapted to transfer an actuating impulse'to said power mechanism when the pressure in the conduit falls to that at which the apparatus is adjusted; said power mechanism comprising means responsive to open said valve, to maintain said valve in open position for a predetermined period, and to close said valve in a cycle; whereby said cycle is completed, each time it is initiated, without further influence from said pressure sensitive means.

8. In fluid dispensing apparatus, the combination of a source of fluid under pressure; a conduit adapted for connection with a receiver; a valve between said source and said conduit; power mechanism in operating relation to said valve; an adjustable pressure sensitive diaphragm connected to said conduit and adapted to transfer an actuating impulse to said power mechanism when the pressure in the'conduit falls to that at which the apparatus is adjusted; said power mechanism comprising means responsive to open said valve,

to maintain said valve in open position for a predetermined period, and to close said valve in a cycle; whereby said cycle is completed, each time it is initiated, without'further influence from said pressure sensitive means.

9. In fluid dispensing apparatus, the combination of a source of fluid under pressure; a conduit adapted for connection with a receiver; a valve between said source and said conduit; power mechanism in operating relation to said valve; adjustable means, for predetermining the pressure to which said receiver shall be charged, from substantially atmospheric pressure to that of said source; a pressure sensitive diaphragm, subjected to the pressure in said conduit and to opposing stress of said adjustable means, adapted to'impart an actuating impulse to said power mechanism when the pressure in-the conduit falls to that at which said first means is adjusted; said power mechanism comprising means to open said valve, to maintain said valve in open position for a predetermined interval, and to close said valve, after said interval, in a cycle in response to said actuating impulse; whereby each cycle, thus initiated, is completed without influence from said diaphragm during said cycle and such cycles are repeated automatically until the predetermined pressure is attained in said receiver.

10. In fluid dispensing apparatus, the combination with a casing inclosing two diaphragm chambers, each containing a reciprocatory diaphragm; of fluid pressure supply conduits leading to said chambers; a restricted vent from one chamber; a fluid pressure service conduit, adapted for connection to a receiver, leading from the other of said chambers; respective springs opposed to the fluid pressure on said diaphragms; means for adjustably varying the pressure of the spring opposed to the service pressure diaphragm; two valves for controlling respectively the passage of fluid to said diaphragm chambers; power mechanism in operating relation to said valve which controls passage of fluid to said chamber having said service conduit leading therefrom, said power mechanism comprising means, responsive to an I actuating impulse, to open said valve, to main- 11. In fluid dispensing apparatus, the combination with a casing inclosing two diaphragm chambers, each containing a reciprocatory diaphragm; of fluid pressure supply conduits leading to said chambers; a restricted vent from one chamber;

afluid pressure service conduit, adapted for connection to a receiver, leading from the other of said chambers; respective springs opposed to the fluid pressure on said diaphragm; means for adiustably varying the pressure of the spring opposed to the service pressure diaphragm; two valves for controlling respectively the passage of fluid to said diaphragm chambers; power mechanism in operating relation to said valve which controls passage oi fluid to saidchamber having said service conduit leading therefrom, said power mechanism comprising means, responsive to an actuating impulse, to open said valve, to maintain said valve in open position for-a predetermined interval, and to close said valve, after said interval, in a complete cycle; and means, connected with said diaphragms, for automatically operating said valves in accordance with fluctuations in the fluid pressure on both diaphragms, including a rocker cam, and a cam roller cooperative therewith; whereby fluid is dispensed, in pulsations, from said supply conduit through said service conduit, until the pressure in the receiver is equal to the effective pressure of the adjusted spring.

12. In fluid dispensing apparatus, the combination with a casing inclosing twodiaphragm chambers, each containing a reciprocatory diaphragm; of fluid pressure supply conduits leading to said chambers; a restricted vent from one chamber; a fluid pressure service conduit, adapted for connection to a receiver, leading from the other of said chambers; respective springs opposed to the fluid pressure on said diaphragms; means for adjustably varying the pressure of the spring opposed to the service pressure diaphragm; two valves for controlling respectively the passage of fluid to said diaphragm chambers; power mechanism in operating relation to said. valve which controls passage of fluid to said chamber having said service conduit leading therefrom, said power mechanism comprising means, responsive to an actuating impulse, to open said valve, to main tain said valve in open position for a predetermined interval, and to close said valve, after said interval, in a complete cycle; and means, connected with said dlaphragms, for automatically operating said valves in accordance with fluctua-.

tions in the fluid pressure on both diaphragms, including two rocker cams, and two cam rollers cooperative therewith; whereby fluid is dispensed, in pulsations, from said supply conduit through said service conduit, until the pressure in the receiver is equal to the effective pressure of the adiusted spring.

13. In fluid dispensing apparatus, the combination with a casing inclosing two diaphragm chambers, each containing a reciprocatory diaphragm; of fluid pressure supply conduits leading to said chambers; a restricted vent from one chamber; a fluid pressure service conduit, adapted for connection to a receiver, leading from the other of said chambers; respective springs opposed to the fluid pressure on said diaphragms; means for adiustably varying the pressure of the spring opposed to the service pressure diaphragm; two valves for controlling respectively the passage of fluid to said diaphragm chambers; power mechanism in operating relation to said valve which controls passage of fluid to said chamber having said service conduit leading therefrom, said power mechanism comprising means, responsive to an actuating impulse, to open said valve, to maintain said valve in open position for a predetermined interval, and to close said valve, after said interval, in a complete cycle; and means, connected with said diaphragms, for automatically operating said valves in accordance with fluctuations in the fluid pressure on both diaphragms, including two bell crank levers respectively operatively related to the two diaphragms, and to said springs, two rocker cams, and two cam rollers cooperative therewith; whereby fluid is dispensed, in pulsations, from said supply conduit through said service conduit, until the pressure in the receiver is equal to the efl'ective pressure of the adjusted spring.

' VIRGIL D. BARKER. 

